One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(6,9)(10,12)(14,15)(18,19)(21,22,25,26)(23,24,28,27)(2,3)(13,14,17,15)(16,19,20,18)(22,26)(23,28)(13,14,17,15)(16,18,20,19)(21,23)(22,27)(24,26)(25,28)(2,3)(5,6)(7,10)(8,9)(11,12)(13,15,17,14)(16,18,20,19)(21,24,25,27)(22,23,26,28)(1,3,4,2)(5,7,8,11)(6,10,9,12)(13,16,17,20)(14,18,15,19)(21,23)(22,24)(25,28)(26,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.